Improved machine for making bolt-heads



UNITED STATES PATENT OEEIoE.

O. H. EMERSON AND J. F. EMERSON, OF NEI/V YORK, N. Y.

IMPROVED MACHINE FOR MAKING BOLT-HEADS.

Specification forming part of Letters Patent No. 89,211, dated April 20, 1869.

To all whom 'it may concern Beit known that we, C. H. EMERSON and J. F. EMERSON, of the city, county, and State of New York, have invented a new and useful Improvement in Bolt-Headin g Machines, of which the following is a full, clear, and exact description, reference being had to the accompanying drawing, forming part of this speciiioation, and in which- Figure l represents a plan of a bolt-heading machine constructed in accordance with our improvement; Fig. 2, a central longitudinal vertical section of the same, and Fig. 3 a transverse section thereof through the line x a in Fig. l.

Similar letters of reference indicate corresponding parts.

This our improvement embraces in the 011e lmachine a double header for action in concert with gripers and double squaring-jaws, so arranged and operating that the bolt to be headed is first pressed into a conical or rivethead shape at its end, and afterward squared in a preparatory manner, and subsequently jumped or pressed up to give a rounded iinish to the top or back of the head, and then squared again at its sides to complete the head, whereby a most perfect and solid head is formed on the end of the bolt.

Referring to the accompanying drawing, A represents the bed of the machine, and B the driving-shaft carried thereon. On this shaft are hung or arranged cams C, D, E, and F, the offices of which will be explained in their regular order.

The heated bar from which the bolts are to be made is rst introduced along an upper groove made in one side of a vertical slot, b, running through a front guide, G, and farther. introduced or passed through between gripers H H and formers or squaring-jaws I I up to against a top header, J in or during the back position of the latter. The gripers II H, or one of them, are then made to slide forward for the purpose of holding the bar by means of the cam C, acting against and moving a slidu ing bar, K, formed of a beveled configuration at 'its front end. After this the header J is made to advance by the action of the cam D against a sliding stock, L, carrying the top header, J, and a lower, header, J The top header, J, which thus first acts against the end of the bar, is so cupped or shaped as that, in its advance stroke, it gives a rivet-head formation to the end of the bar, which formation, it is found from practice, secures a more solid and perfect square or polygonal shaped head on suitable formers being applied to iinish the head than any other preparatory formation. rIhe head having been thus prepara torily jumped on the bolt or end of the bar, as

shown by red lines in Fig. 2, the headingstock L retires, and the squaring-jaws I I are made, by the action of the cams E and F on bevel-nosed sliding bars S S, to approach each other and square up the sides of the head by means of upper recesses, c c, formed in them. After this thejaws I Iretire or open, andalso the gripers H H, which enables the workman to shift the bar from the top groove in the guide Gr to a lower groove therein, when the same operation is gone through as before, only in connection with a lower header, J', and lower recesses, e e, in the squaring-jaws I I, the gripers H II first closing to hold the bar or partiallyheaded bolt then the header J coming forward to give a rounded finish to the end of the head, as shown by red lines in Fig. 2, and afterward the jaws I I advacin g to finish the squarin g up of the sides of the head by the recesses e e formed in said jaws, said recesses being somewhat smaller than the upper recesses, c c, and the lower header, J preferably lying a little in advance of the upper header, J. L

On the opening of the gripers again the bar or bolt lnay be turned to repeat the compressing or finishing action by or on a changed position of the surfaces. The griper or gripers, heading-stock, and squaring-j aws, when relieved from being pressed forward by the cams whichgive to them their timely advance actions, are thrown back or made to recede by means of springs N, O, In), and Q, of any suitable form or character. To prevent damage, however, in case of any irregularity in act-ion ofthe 'parts-as, for instance, in case of the squaring-jaws I I not retiring in proper time for the headers J J to make their advance strokethe forward portion of the heading-stock L is formed or provided with wedges or inclined surfaces ff, which, as the headers advance, act

against inolines g g, attached to the sliding jaws I I, and force the latter back should they not have previously retired by the action of their springs.

After the bolt has been headed, it is out off from the bar by any suitable cutter attached to the machine, and in due course a sneeeeding bolt formed and headed till the bar is Worked up.

What is here claimed, and desired to be secured by Letters Patent, is-

1. The combination ofthe headingstook L, havin gt-hereon preparatory and inishingheaders J J constructed substantially as described, with the gripers Il H and head-squaring jaws 

